Corona shield



A. H. MANKIN CORONA SHIELD Jan. 13, 1948.

Filed April 28, 1944 Patented Jan. 13, 1948 CORONA SHIELD Arthur H.Mankin, Philadelphia, Pa., assignor, by mesne assignments, to PhilcoCorporation, Philadelphia, Pa., a corporation oi' PennsylvaniaApplication April 28, 1944, Serial No. 533,221

This invention relates to the electrical phenomenon known as corona.More particularly it has reference to the prevention of corona atjunctures of high potential conductors.

In electrical apparatus employing high potennating corona and itsdeleterious effects at connections of high potential conductors.

another object of the invention is the provision of an inexpensive andefficient shield or enclosure for this purpose.

A further object of the invention is to provide a shield which isespecially adapted to facilitate such connections.

A still further object of the invention is to provide a novel connectorand shield device which While it is simplifies and greatly facilitatesthe making of the connections.

In the accompanying drawing:

Fig. 1 is a plan view of a shielding device provided in accordance withthe present invention, witdh the cover removed for better illustration;an

Fig. 2 is a vertical sectional view of the device taken along line 2-2of Fig, 1.

As illustrated in the drawing, the preferred embodiment 0f the novelshielding device comprises a lower substantially cup-shaped metallicmember '2 and a dome-shaped metallic cover 3 adapted to be fitted overthe upper edge 4 of member 2, as illustrated in Figure 2. These twomembers form a hollow shield which encloses the electrical joint withwhich the device is associated. It is preferred to employ a shield ofgenerally spherodal shape because curved surfaces are most resistant tocorona.

Opposed shallow detents 5 and 6 are provided to firmly secure the shieldmembers together. As may be seen by reference to Figure 1, the shield ispreferably oval-shaped to facilitate registry of detents 5 and 6 whenassembling cover 3 with cupped member 2. It should be understood,however, that the shield may assume any other ap- 5 Claims. (Cl. 174-35)propriate shape, such as that of a sphere, without departing from theinvention.

Member 2 has in its bottom wall 1 an aperture 8 through which a screw 9passes to secure the member to an insulating panel I0. Screw 9 alsosecures, within and on the bottom wall of member 2, a connection memberII having a pair of integral upwardly extending terminal prongs I2 andI3. On opposed sides of member 2 adjacent its bottom wall 1,` areapertures I4 and I5 formed by punching, 0r other suitable method, toprovide inturned portions I6 and I'l with all sharp edges and cornerswithin said member.

When connecting the high potential conductors I8 and I 9, their exposedends 20 and 2| a.' e passed through apertures I4 and I5 and suitablysecured to prongs I2 and I3 as by soldering, indicated at 22. Theapertures are preferably of a'size to t snugly about the insulation enthe wires. At this time the cover 3 is removed, and since the prongs I2and I3 project above the cup member 2, the connections may be made veryeasily. Since the device may be quite small, and may in fact have anoverall dimension as small as the facilitation of connection is verydesirable. After the connections are made, the dome-shaped cover 3 issnapped over edge 4 of member 2 to thus completely enclose allconnections and sharp edges. The lower edge of member 3 may be roundedto prevent corona at that point.

It may be seen that prongs II and I2 direct contact the floor of lowermember 2 to maintain the shield and the conductors I1 and I8 at the samepotential. As the curved surface of the spheroidal shield is highlyresistantt to corona discharge, it will be apparent that the inventionhas provided an inexpensive and practical device for effectivelypreventing corona at connection points of high potential conductors, andwhich enables such connections to be made rapidly without precautionarysteps such as rounding or eliminating sharp edges and points.

While a preferred embodiment of the invention has been illustrated anddescribed, it is to be understood that modifications of the structuremay be made within the scope of the appended claims.

I claim:

l. A device for connecting two high potential conductors together andfor preventing corona at the juncture thereof, comprising a two-partmetallic shield, the parts of which are adapted for removable attachmentone to the other, and are shaped to constitute a hollow enclosure whenattached together, one o! said parts being apertured to receive the endsof the conductors to be connected, and means for electrically connectingthe ends of said conductors together and to said one part prior to theattachment of said parts, said shield serving to enclose the electricaljuncture of said conductors when said parts are attached together andbeing maintained at the same electrical potential as the conductors.

2. A device for connecting two high potential conductors together andfor preventing corona at the juncture thereof, comprising a hollowmetallic shield having provision for receiving the ends of saidconductors, a connector element disposed within said shield and servingto interconnect said conductors, and common means for electricallyconnecting said element to said shield sup-,

and for securing the shield to an insulating port.

3. An electrical connector and corona shield device, comprising ashallow cup-shaped metallic member having apertures near the bottomthereof to receive the ends ot conductors to be connected, a connectorelement engaging the bottom A through its engagement with said connectorelement.

4. A device according to claim 3, including common means for maintainingsaid connector element in engagement with said cup-shaped member and forsecuring the latter to an insulating support.

5. A corona-shield electrical joint structure, comprising a two-parthollow metallic shield, the parts of which are adapted for removableattachment, to one another, one of said parts being apertured to receiveconductors, and a pair of conductors extending into said shield andelectrically connected together and to said shield, so that said shieldis maintained at the same electrical potential as said conductors.

ARTHUR H. MANKIN.

REFERENCES CITED The following references are of record in the ille ofthis patent:

v UNITED STATES PATENTS Number Name Date 1,729,873 Hengstenberg Oct. 1,1929 1,914,109 Cadieux June 13, 1933 2,149,027 Meredith Feb. 28, 1939FOREIGN PATENTS Number Country Date 118,145 Austria Sept. 12, 1930

